IC Engines and Nuclear Power Plants problems
- 1. In petrol engines, using a fixed octane rating fuel, the increase in engine speed will decrease the knocking tendency.
Options- A. Yes
- B. No Discuss
Correct Answer: Yes
- 2. In a four stroke cycle diesel engine, the inlet valve
Options- A. opens at 20° before top dead centre and closes at 40° after bottom dead centre
- B. opens at 20° after top dead centre and closes at 20° before bottom dead centre
- C. opens at top dead centre and closes at bottom dead centre
- D. may open and close anywhere Discuss
Correct Answer: opens at 20° before top dead centre and closes at 40° after bottom dead centre
- 3. Special reactors, called breeder reactors, supply a net gain of fissionable material.
Options- A. True
- B. False Discuss
Correct Answer: True
- 4. Which one of the following engines will have heavier flywheel than the remaining ones?
Options- A. 30 kW four-stroke petrol engine running at 1500 r.p.m.
- B. 30 kW two-stroke petrol engine running at 1500 r.p.m.
- C. 30 kW two-stroke diesel engine running at 750 r.p.m.
- D. 30 kW four-stroke diesel engine running at 750 r.p.m. Discuss
Correct Answer: 30 kW four-stroke petrol engine running at 1500 r.p.m.
- 5. Materials which make good moderators do not make good reflectors.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Incorrect
- 6. The cetane number of diesel oil, generally available, is
Options- A. 20 to 25
- B. 25 to 30
- C. 30 to 40
- D. 40 to 55 Discuss
Correct Answer: 40 to 55
- 7. The octane number of petrol, generally available, is
Options- A. 20 to 40
- B. 40 to 60
- C. 60 to 80
- D. 80 to 100 Discuss
Correct Answer: 80 to 100
- 8. The air standard efficiency ofan I.C. engine is given by (where r = Compression ratio, and ? = Ratio of specific heats)
Options- A. 1 - r? - 1
- B. 1 + r? - 1
- C.
- D. none of these Discuss
Correct Answer:
- 9. In a four stroke cycle diesel engine, the compression
Options- A. starts at 40° after bottom dead centre and ends at 10° before top dead centre
- B. starts at 40° before top dead centre and ends at 40° after top dead centre
- C. starts at top dead centre and ends at 40° before bottom dead centre
- D. may start and end anywhere Discuss
Correct Answer: starts at 40° after bottom dead centre and ends at 10° before top dead centre
- 10. The ratio of the work obtained at the crankshaft in a given time to the energy supplied during the same time is called
Options- A. mechanical efficiency
- B. overall efficiency
- C. indicated thermal efficiency
- D. volumetric efficiency Discuss
Correct Answer: overall efficiency
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